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feat: add a new callback (onEveryThreshold) gets called whenever a th… #3

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feat: add a new callback (onEveryThreshold) gets called whenever a th… #3

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8 changes: 5 additions & 3 deletions src/IntersectionObserver.js
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Original file line number Diff line number Diff line change
Expand Up @@ -41,12 +41,13 @@ class Observer extends Component {
this.init();
this.subscribers.forEach(({ target }) => this.io.observe(target));
}
subscribe(target, onEnter, onLeave) {
subscribe(target, onEnter, onLeave, onEveryThreshold) {
if (!this.io) this.init();
this.subscribers = this.subscribers.concat({
target,
onEnter,
onLeave
onLeave,
onEveryThreshold,
});
this.io.observe(target);
}
Expand All @@ -67,7 +68,8 @@ class Observer extends Component {
const instance = this.subscribers.find(
({ target }) => target === entry.target
);
this.isComing(entry, observer) &&
instance.onEveryThreshold && instance.onEveryThreshold(entry.intersectionRatio);
this.isComing(entry, observer, instance) &&
instance.onEnter &&
instance.onEnter(entry);
this.isLeaving(entry, observer) &&
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13 changes: 10 additions & 3 deletions src/Observable.js
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Original file line number Diff line number Diff line change
Expand Up @@ -13,30 +13,37 @@ class Observable extends Component {
this.onRef = this.onRef.bind(this);
this.onEnter = this.onEnter.bind(this);
this.onLeave = this.onLeave.bind(this);
this.onEveryThreshold = this.onEveryThreshold.bind(this);
}
onRef(ref) {
this.ref = ref;
}
onEnter() {
this.setState({ isVisible: true }, () => {
const { onLeave, onEnter, children, onceOnly, ...props } = this.props;
const { onLeave, onEnter, children, onceOnly, onEveryThreshold, ...props } = this.props;
this.props.onEnter && this.props.onEnter(props);
this.props.onceOnly && this.unsubscribe(this.ref);
});
}
onLeave() {
const { onLeave, onEnter, children, onceOnly, ...rest } = this.props;
const { onLeave, onEnter, children, onceOnly, onEveryThreshold, ...rest } = this.props;
this.setState({ isVisible: false }, () => {
this.props.onLeave && this.props.onLeave(rest);
});
}
onEveryThreshold(intersectionRatio){
const { onLeave, onEnter, children, onceOnly, onEveryThreshold, ...rest } = this.props;
this.setState({ isVisible: true }, () => {
this.props.onEveryThreshold && this.props.onEveryThreshold({intersectionRatio, ...rest});
});
}
componentDidMount() {
if (!this.context.subscribe) {
throw new Error(
"Expected Observable to be mounted within IntersectionObserver"
);
}
this.context.subscribe(this.ref, this.onLeave, this.onEnter);
this.context.subscribe(this.ref, this.onLeave, this.onEnter, this.onEveryThreshold);
}
render() {
const { isVisible } = this.state;
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